IMHO you cannot cap POH income if you plan on selling them. Capping them into the purchase price is forever in terms of mortgage, but the income is very limited in scope and time.
Once the homes are paid off, your income goes down, but your mtg payment stays the same.
This is not even taking into account that the home portion of the rent has a very low profit margin. The lot portion is maybe 70% profit, while the home portion is maybe 30% if your lucky, plus it is finite meaning that it goes away after a set period of time.
If there is only one point that I really took to heart from Franks lessons is that POH's are worth very little.